情态动词must,can,should等咋区别啊???答:You must obey the school rules.你必须遵守校规。 情态动词数量不多,但用途广泛,主要有下列: can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would),have (to) ,had better.can和could的用法 1. 表示能力或客观可能性,还可以表示请求和允许。如: Can yo...
情态动词的用法,can,may,must,need,could,dared答:情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语 一、 can, could 1) 表示能力(体力、知识、技能)。Can you lift this heavy box...